锌是水稻仅次于氮磷的营养元素,缺锌产生缩苗、红苗症状,影响产量。1975年我省在滨海稻区首次发现水稻缺锌症,并进行了调查,结果表明是由于成土母质、土壤理化性状、施肥不合理及水稻连作等原因造成的。不仅在滨海平原,而且在内陆洼地、河谷滩地部有缺锌稻田,面积占70%左右。 Zinc is second only to nitrogen and phosphorus nutrients, zinc deficiency produce reduced seedlings, red seedling symptoms affect the yield. In 1975, the province found the first zinc deficiency in paddy rice in the coastal area and conducted a survey. The results showed that it was caused by such factors as soil parent material, soil physical and chemical properties, unreasonable fertilization and continuous cropping of rice. Not only in the coastal plains, but also in the inland depressions, valleys have zinc deficiency paddy fields, accounting for about 70% of the area.